Gaya APA
Olii, Helena. (2008).
Public Speaking cet. 3 .
Jakarta:
Indeks.
Gaya Chicago
Olii, Helena.
Public Speaking cet. 3.
Jakarta:
Indeks,
2008.
Buku English.
Gaya MLA
Olii, Helena.
Public Speaking cet. 3.
Jakarta:
Indeks,
2008.
Buku English.
Gaya Turabian
Olii, Helena.
Public Speaking cet. 3.
Jakarta:
Indeks,
2008.
Buku English.